When I was in school we had UCA staff come in and judge our tryouts. We always had different stations where we rotated (jumps, dance, cheer, ect.) so we had multiple judges and the head coach would be at one of the stations.
My aunt use to coach the middle school cheerleaders and would used outside judges one year and after tryouts refused to use them again. She came in during the summer after the team was already chosen the previous year so she got to know the girls before tryouts the following year. Well when the outside judges gave her the scoresheets and she sat down to tally them she had girls who she knew deserved it not make the cut and others make it because, as the judges said,they were "prettier". Yeah that is right they seriously wrote on the scoresheet that they were pretty and had the "cheerleader look". It broke her heart to have to cut the girls she knew had the talent, but had to do it because she wasn't going to make it unfair. After that year she judged tryouts herself and I usually helped. What made it worse for her is the girls who got cut never returned to cheer even though they were some of the most talented ones.